Composition for coating a paper wrapper for smoking articles

ABSTRACT

The present invention relates to a composition for coating paper wrapper for smoking articles, which comprises a combination of gum arabic, preferably between 40% and 95% by weight with respect to the total dry material weight of the composition, and a filler that comprises calcium carbonate, preferably in an amount of at least 5% by weight with respect to the dry material weight of the composition, alone or in combination with other substances such as, for example, kaolin, calcium sulphate, titanium dioxide and mixtures thereof, and to the use thereof for producing a paper wrapper for smoking articles.

FIELD OF THE INVENTION

The present invention falls into the field of the technology of paperwrapper for smoking articles.

BACKGROUND OF THE INVENTION

Cigarette manufacturers increasingly require that the cigarettes withlittle tendency to ignition meet the legal requirement in the UnitedStates that 75% of them extinguish on a support normally consisting of10 sheets of a particular filter paper type. This percentage ofcigarettes that extinguish is measured in the United States through theself-extinguishment test or “SE” for its acronym in English,Self-Extinguishment, ASTM E2187, the only official test currentlyavailable.

But in addition, cigarette manufacturers also require the percentage ofcigarettes that extinguish during free combustion, that is, withoutbeing in contact with anything, to be minimal and, ideally, zero. Thisis measured using an unofficial test called “FASE” for its acronym inEnglish, Free-Air Self-Extinguishment.

The basis of the measurement of the FASE value is to determine thepercentage of cigarettes that burn out completely after lighting themand smoking them for 5 mm (normally in a cigarette smoking machine) andholding them by the filter without touching anything more inside a glasscabinet or similar, where the air circulation is kept as low aspossible, to ensure total removal of the smoke from the combustion (thisparameter depends on the volume of the glass cabinet, but for the caseof a glass cabinet where there is installed a cigarette smoking machine,this flow rate is around 0.5 liter/minute).

There is abundant state of the art on methods to obtainself-extinguishing cigarettes, such as the patent applicationWO2003/15543. The use of the gum arabic has meant an importantcontribution in the obtainment of self-extinguishing cigarettes, but itwas necessary to improve the filler of the film forming compositionreplacing the aluminium hydroxide by compounds that increase thepercentage of cigarettes that do not extinguish at free combustion.

Calcium carbonate is mentioned in patents as U.S. Pat. No. 4,615,345 butnot in the sense of reducing the FASE value comparatively to aluminiumhydroxide.

Patent EP1166656 B1 discloses the use of calcium carbonate as the fillerwith a particle size of 1.3 μm and with different forms. However it isnot combined with gum arabic either. Something similar happens in thepatent application EP1403432, which discloses the use of calciumcarbonate with particle size of diameter less than 1.3 μm.

On the other hand, application US20030178039 mentions gum arabic amongpossible forming film materials for a composition applicable to papersdispersible in water, as well as calcium carbonate as possible filler insaid composition. In addition, both substances are not listed as aspecific combination, so there is no incentive for the expresscombination of both substances. Therefore, the differences between thisapplication and the present invention are: (1) while the new compositionobject of this application is directed to the so-called “cigarettepaper”, the application US20030178039 is directed only to the plug wrapand tipping paper; (2) the object of the present invention is theextinction of the cigarettes, while the object the applicationUS20030178039 is to promote the dispersibility in water of the filterpapers and mouthpiece.

With the paper obtained according to the present invention lowering theFASE value for a given SE value comparatively to aluminium hydroxide isachieved, as it will be shown below.

OBJECT OF THE INVENTION

The present invention has as an object a composition for coating paperwrapper for smoking articles which comprises a combination of gum arabicand calcium carbonate that provides the advantage of obtainingself-extinguishing cigarettes with a lower percentage ofself-extinguishment during free combustion than using aluminiumhydroxide.

The method of the invention allows providing a paper for cigarettes,preferably by the internal side or in contact with the tobacco, with acoating suitable for keeping the FASE parameter with the lowest possiblevalue. Said coating can be applied in discrete areas separated from eachother through areas without coating, or continuously, with the use ofcommon printing techniques. Said coating composition is obtained from asolution prepared based of gum arabic or acacia gum, with a filler thatcontains at least calcium carbonate. Other mineral fillers that also areuseful for this purpose, and that could be used in combination withcalcium carbonate, are kaolin, calcium sulphate, titanium dioxide, etc.Combustion agents such as citrate, preferably trisodium andtripotassium, alone or combined with each other can also be added to thecomposition.

Throughout this specification the terms “composition” and “ink” are usedinterchangeably. When referring to the composition in dry material, itis expressly stated. In addition, the expressions “with respect to thedry material” and “with respect to solids” or “with respect to thesolids” are also used interchangeably.

DESCRIPTION OF THE INVENTION

The present invention is related in the first place to a composition forcoating paper wrapper for smoking articles which comprises a combinationof gum arabic and a filler which comprises calcium carbonate, alone orin combination with other substances.

According to particular embodiments of the composition for coating paperwrapper for smoking articles the filler may comprise calcium carbonatein combination with other substances selected from kaolin, calciumsulphate, titanium dioxide and mixtures thereof.

According to additional particular embodiments of the composition forcoating paper wrapper for smoking articles, the filler may comprisecalcium carbonate in combination with citrate, preferably trisodium andtripotassium citrate.

The gum arabic is present in the composition in a percentage preferablycomprised between 40% and 95% by weight, with respect to the totalweight of dry material, more preferably between 45 and 90% by weight,even more preferably between 50 and 80% by weight with respect to thetotal weight of dry material of said composition.

The rest of the coating composition is at least calcium carbonate, aloneor in combination with other substances. According to the presentinvention, the percentage of calcium carbonate on the dry material ofthe composition is of at least 5% by weight, and it is present in thiscomposition in an amount between 5 and 60% by weight with respect to thetotal dry weight of the composition, preferably of between 10 and 55% byweight, and more preferably of between 20 and 50% by weight.

A especially preferred coating composition is a composition or ink thathas a content in dry material of between 25 and 40% by weight withrespect to the total weight of the composition, and in which said drymaterial comprises:

-   -   67% by weight of gum arabic with respect to the dry material    -   and 33% by weight, of calcium carbonate with respect to the dry        material.

The composition is applied in liquid form to the paper wrapper of thesmoking article.

With this amount of calcium carbonate the following benefits areobtained:

-   -   The visibility of the printed band by the side opposite to the        printing is lower.    -   The diffusivity value to achieve the desired value of extinction        of the cigarettes according to the ASTM E2187 test is higher        when using calcium carbonate than when using aluminium hydroxide        according to the patent application WO2003/15543 and, therefore,        using calcium carbonate reduces the content of tar, nicotine and        carbon monoxide, a key factor to the fulfilment of the European        legislation in force.

An additional embodiment of the composition, also preferred, is acomposition having a content of dry material of between 25 and 40% byweight with respect to the total weight of the composition andcomprising:

-   -   between 40% and 95% of gum arabic with respect to the dry        material weight,    -   between 5 and 60% by weight of calcium carbonate with respect to        the dry material weight.

An additional embodiment of the composition, also preferred, is acomposition having a content of dry material of between 25and 40% byweight with respect to the total weight of the composition andcomprising:

-   -   between 40% and 95% by weight of gum arabic with respect to the        dry material weight,    -   between 5 and 60% by weight, of calcium carbonate with respect        to the dry material weight.    -   between 2.5% and 4% by weight, of a combustion agent selected        from trisodium citrate, tripotassium citrate and mixture of        both, preferably, approximately 3.5% by weight with respect to        the dry material weight.

The diffusivity value to achieve a correct extinguishment value of thecigarettes according to the ASTM E2187 test is higher the higher thepercentage of calcium carbonate is on the weight by solids in the ink,making it preferable to use an ink with high levels of calciumcarbonate.

-   -   With respect to the measurement of the diffusivity (also called        diffusion coefficient or capacity), although there is not a        standard method for measuring it, its foundation consists of the        following: the paper sample is placed between two chambers. In        one of them there is a constant nitrogen flow and in the other        the same flow of carbon dioxide. There is no difference in        pressure between both chambers. The nitrogen is diffused through        the paper towards the carbon dioxide stream and vice versa. The        concentration of carbon dioxide at the exit of the chamber where        nitrogen flows is continuously measured, this concentration        being the one used for the calculation of the diffusivity of the        sample.

The present invention also has as object the use of the describedcomposition to partially or fully coat a paper wrapper for smokingarticles. The composition can be applied by printing by means of atechnique selected from flexography, rotogravure, screen printing andoffset.

The composition can be applied on a paper wrapper for smoking articlesas a partial coating, in the form of bands parallel to each other andarranged perpendicularly to the axis of the smoking article or with aslight deviation of said axis, for example at an angle of between 0.5°and 5° approximately with respect to the perpendicular of the axis ofsaid smoking article. Said bands parallel to each other, may have awidth of between 4and 10 mm, and preferably between 6 and 8 mm. Thebands parallel to each other may be separated by a distance of between10 and 30 mm, and they are preferably separated by a distance of between15 and 25 mm.

Said composition can be applied to the paper wrapper for smokingarticles in amounts comprised between 0.5 and 10 grams of dry materialper square meter of paper, and preferably between 0.9 and 8 grams of drymaterial per square meter of paper, measured in the printed area.

For the application of the composition standard printing techniques,such as flexography, rotogravure, screen printing and offset can beused, although it is preferred to use flexography continually or inbands, with the use of a transfer roller designed for a proper transferof said composition to the paper wrapper for a smoking article. Inaccordance with the invention, this composition should be applied tosaid paper in amounts comprised in the range of between 0.5 and 10 gramsof dry material per square meter of paper, and more preferably between0.9 and 8 grams of dry material per square meter of paper, measured inthe printed area.

A very important parameter to be considered when printing a paper usingany technique is the viscosity of the composition. There is a limit ofviscosity in rotogravure and flexography above which the transfer of thecomposition to the support to be printed becomes difficult. Based on ourexperience, viscosities between 80 and 600 cps, measured with aviscometer Brookfield RVT at room temperature, 20 rpm and with thesuitable rod for these viscosity values, are the most appropriate.

The paper air permeability is measured in ml/min/cm², at a pressure dropof 1 kPa, as described in the standard method CORESTA n° 40. For thisreason, this unit is commonly called Coresta Unit, or CU.

The initial permeability of the paper can be 19 CU or higher, forexample, 150 CU. The fibres that make up the paper can be wood-based orothers, as is the case of the annual plants flax, hemp, esparto, juteand others. These papers have weights of for example between 19 and 40g/m², preferably of between 20 and 30 g/m².

The present invention has in addition as an object a paper wrapper forsmoking articles which comprises the composition described above.

A particular embodiment of the paper wrapper for smoking article withlow propensity to ignition is a wrap comprising, at least, areas coatedwith an ink composed by:

-   -   a percentage of dry material of between 25 and 40% by weight        with respect to the total composition,    -   between 40% and 95% by weight of gum arabic with respect to the        dry material weight,    -   between 5 and 60% by weight, of calcium carbonate with respect        to the dry material weight. and preferably, having an initial        air permeability of between 10 CU and 150 CU.

An additional particular embodiment of the paper wrapper for smokingarticle with low propensity to ignition is a wrap comprising, at least,areas coated with an ink composed by:

-   -   a percentage of dry material of between 25 and 40% by weight        with respect to the total composition,    -   between 40% and 95% by weight of gum arabic with respect to the        dry material weight,    -   between 5 and 60% by weight, of calcium carbonate with respect        to the dry material weight,    -   between 2.5% and 4% by weight, of a combustion agent selected        from trisodium citrate, tripotassium citrate and mixture of        both, preferably, approximately 3.5% by weight with respect to        the dry material weight, and preferably, having an initial air        permeability of between 10 CU and 150 CU.

The present invention has in addition as an object a smoking article,preferably a cigarette, which comprises the paper wrapper for smokingarticle described above.

Throughout the present specification the word “ink” and the expression“coating composition” should be considered synonymous and are usedinterchangeably.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the results obtained of percentage of extinguishedcigarettes, measured according to ASTM E2187 (SE) and according to theparameter of free combustion extinguishment (FASE), against thediffusivity values, for cigarettes with a filler exclusively of calciumcarbonate.

FIG. 2 shows the results obtained of percentage of extinguishedcigarettes, measured according to ASTM E2187 (SE) and according to theparameter of free combustion extinguishment (FASE), against thediffusivity values, for cigarettes with a filler exclusively ofaluminium hydroxide.

EXAMPLES OF EMBODIMENT

Preparation of a Coating Composition

The preparation of a composition according to the invention is describedin the patent application WO2003/15543.

Such composition is prepared by dissolving a predetermined amount of gumarabic or acacia gum in water in concentrations that vary between 40 and95% by weight with respect to the total weight of dry material of thecomposition, preferably between 45 and 90% by weight, more preferablybetween 50 and 80% by weight, and even more preferably between 60 and68% by weight, the rest of solids being calcium carbonate at least.Water is added until completing 100% by weight.

The preparation of the coating liquid ink, or composition, is made bymixing the appropriate amounts of a solution of gum arabic in water at39% and calcium carbonate in the suitable system to achieve a gooddispersion of the calcium carbonate (normally, said system are stirrerswith an important shear component such as for example, a Silverstonestirrer), adding at the end the required amount of water to adjust thesuitable concentration of dry material.

This concentration of dry material depends basically on two factors:

-   -   the printing parameters, which in flexography is mainly the        volume of anilox roller    -   the diffusivity and/or the air permeability of the paper wrapper        for smoking articles to be printed. The diffusivity and/or the        air permeability of the paper wrapper for smoking articles are        not parameters that strictly measure the same, although they are        related for a specific sample of paper wrapper for smoking        articles.

Example of application of the coating composition and analysis of theinfluence of the type of filler.

To determine the working limits with our technology, we have startedfrom an ink consisting of 67% by weight of dry material of gum arabic,and 33% by weight with respect to dry material, of filler at severallevels of content in solids, this filler being aluminium hydroxide witha particle size of 1.2 microns in one case and calcium carbonateprecipitated with a particle size of less than 1 micron in the other.With this composition there have been printed bands with differentweights on a paper wrapper for smoking articles manufactured with woodfibres and with an air permeability of 50 CU.

Specific Application Mode of the Composition to the Wrap

The layer of ink or coating composition was printed with a central drumflexographic machine, using a 30 cc/m² anilox and a 2.54 mm etchingplate.

The diffusivity of the bands printed has been analyzed and cigaretteshave been manufactured using tobacco of a typical “American blend”. Thecigarettes have been analyzed according to the ASTM E2187 method fordetermining their extinguishment on a filter paper support (SE).Likewise their free combustion extinguishment (FASE) has beendetermined.

FIGS. 1 and 2 show the results of percentage of extinguished cigarettesmeasured according to the self-extinguishment (SE) parameter andaccording to the free combustion extinguishment (FASE) parameter,against the diffusivity values, for cigarettes with a filler exclusivelyof calcium carbonate (FIG. 1) and for cigarettes with a fillerexclusively of aluminium hydroxide (FIG. 2).

Taking into account that the objectives are to obtain a minimum of 75%of cigarettes extinguished on support (% SE) and a FASE value as low aspossible, this study shows that the values of % FASE for this value of75% SE are substantially lower using calcium carbonate than usingaluminium hydroxide (approximately, 50% FASE with aluminium hydroxideand 15% with calcium carbonate). In addition, the range of diffusivityvalues to obtain at least 75% of SE is greater for the case of calciumcarbonate (0 to 0.293 cm/sec) than for the case of aluminium hydroxide(0 to 0.172 cm/sec).

Example of a Cigarette Wrap According to the Invention

Although any paper wrapper for smoking articles, as is the case of thosehaving a permeability to air comprised between 15 and 150 CU, is usefulfor the object of the present invention, for demonstration purposes inthe following table are indicated the characteristics of the paper usedin the following tests:

TABLE 1 Characteristics of the paper wrapper for smoking articles: TYPEOF PAPER VERGE EXTRA 824 N-50_CO WEIGHT g/m² 25.5 ASHES, % 17.0POROSITY, CU 49.1 STREGTH, g/15 mm 1400 ELONGATION, % 1.4 COMBUSTIONADDITIVES * 0.70 * percentage of citric acid monohydrate

What is defined as ashes is a measure of the content of mineral fillerof the paper, which in the case of the paper wrapper for smokingarticles, is normally calcium carbonate. The experimental factor bywhich this value has to be multiplied to obtain the percentage ofcalcium carbonate is 1.695.

The data of composition of the ink, layer weight applied, together withthe diffusivity measured in the band and the SE and FASE values of thecigarettes manufactured with these papers are shown in tables 2 and 3,in the following.

TABLE 2 Composition with aluminium hydroxide: Layer Ink compositionWeight, Diffusivity, (% by weight) g/m² cm/sec % SE % FASE 25% Gumarabic 4.4 0.06 100 100 12.4% aluminium hydroxide 20% Gum arabic 3.40.122 100 85 9.9% aluminium hydroxide 16% Gum arabic 2.5 0.248 35 0 7.9%aluminium hydroxide 12.1% Gum 1.7 0.642 0 0 arabic 5.9% aluminiumhydroxide

TABLE 3 Composition with calcium carbonate: Layer % by weight, inWeight, Diffusivity, the composition g/m² cm/sec % SE % FASE 25% Gumarabic 3.9 0.129 100 100 12.4% calcium carbonate 20% Gum arabic 3.20.144 100 100 9.9% calcium carbonate 16% Gum arabic 2.5 0.293 75 15 7.9%calcium carbonate 12.1% Gum 1.7 0.476 10 0 arabic 5.9% calcium carbonate

In all the cases, the percentages of gum arabic and calcium carbonate ondry material are 67% and 33% respectively. The percentage of drymaterial of the ink used in the printing varies.

FIGS. 1 and 2 show the relationship between diffusivity of the band andthe SE and FASE percentages for each type of filler.

It is very difficult to achieve predetermined SE values, so inks withvarious contents of dry material are prepared keeping the relationshipbetween gum arabic and filler, and it is interpolated.

The invention claimed is:
 1. A composition for coating paper wrappersfor smoking articles, consisting of water, between 40% and 95% by weightof gum arabic with respect to the total dry material weight of thecomposition, and between 5 and 60% by weight of calcium carbonate withrespect to the total dry material weight of the composition, wherein thecomposition has a viscosity of between 80 and 600 cps, measured with aBrookfield RVT viscometer at room temperature, and wherein a smokingarticle comprising a paper wrapper coated with the composition isself-extinguishing and has an SE value equal or higher than 75% and aFASE value equal or lower than 15%.
 2. A method of coating a paperwrapper for a smoking article comprising applying a composition as atotal or partial coating of a paper wrapper that wraps the tobacco rodof the smoking article, wherein the composition comprises gum arabic anda filler, wherein the filler comprises calcium carbonate alone or incombination with substances selected from the group consisting ofkaolin, calcium sulphate, citrate, titanium dioxide and mixturesthereof, wherein the composition comprises: between 40% and 95% byweight of gum arabic with respect to the total dry material weight ofthe composition, and between 5% and 60% of calcium carbonate withrespect to the total dry material weight of the composition, wherein thecomposition has a viscosity of between 80 and 600 cps, measured with aBrookfield RVT viscometer at room temperature, wherein the compositionis applied by printing by means of a technique selected from the groupconsisting of flexography and rotogravure, and wherein the compositionprovides a self-extinguishing smoking article having an SE value equalor higher than 75% and a FASE value equal or lower than 15%.
 3. Themethod of claim 2, wherein the composition is applied on a paper wrapperthat wraps the tobacco rod of the smoking article as partial coating, inthe form of bands parallel to each other and arranged perpendicularly tothe longitudinal axis of the smoking article.
 4. The method of claim 2,wherein the composition is applied on a wrapper that wraps the tobaccorod of the smoking article paper as partial coating, in the form ofbands parallel to each other and arranged at an angle of between 0.5°and 5°, approximately with respect to the perpendicular of thelongitudinal axis of the smoking article.
 5. The method of claim 4,wherein the bands parallel to each other have a width of between 4 and10 mm.
 6. The method of claim 4, wherein the bands parallel to eachother have a width of between 6 and 8 mm.
 7. The method of claim 4,wherein the bands parallel to each other are separated by a distance ofbetween 10 and 30 mm.
 8. The method of claim 4, wherein the bandsparallel to each other are separated by a distance of between 15 and 25mm.
 9. The method of claim 2, wherein the composition is applied byprinting the paper wrapper that wraps the tobacco rod of a smokingarticle in amounts comprised between 0.5 and 10 grams of dry materialper square meter of paper, measured in the printed area.
 10. The methodof claim 2, wherein the composition is applied by printing the paperwrapper that wraps the tobacco rod of the smoking article in amountcomprised between 0.9 and 8 grams of dry material per square meter ofpaper, measured in the printed area.
 11. The method of claim 2, whereinthe composition comprises between 45% and 90% by weight of gum arabicwith respect to the total dry material weight of the composition. 12.The method of claim 2, wherein the composition consists of water,between 40% and 95% by weight of gum arabic with respect to the totaldry material weight of the composition, and between 5 and 60% by weightof calcium carbonate with respect to the total dry material weight ofthe composition, wherein the composition provides a self-extinguishingsmoking article having an SE value equal or higher than 75% and a FASEvalue equal or lower than 15%, and wherein the composition has aviscosity of between 80 and 600 cps, measured with a Brookfield RVTviscometer at room temperature.
 13. The method of claim 2, wherein thecomposition consists of water, between 40% and 95% by weight of gumarabic with respect to the total dry material weight of the composition,and a filler consisting of calcium carbonate and substances selectedfrom the group consisting of kaolin, calcium sulphate, citrate, titaniumdioxide and mixtures thereof, wherein the calcium carbonate is presentin an amount of between 5% and 60% by weight with respect to the totaldry material weight of the composition, wherein the composition providesa self-extinguishing smoking article having an SE value equal or higherthan 75% and a FASE value equal or lower than 15%, and wherein thecomposition has a viscosity of between 80 and 600 cps, measured with aBrookfield RVT viscometer at room temperature.
 14. A coated paperwrapper for obtaining a self-extinguishing smoking article, wherein suchcoated paper wrapper comprises a composition as a total or partialcoating, wherein the composition comprises gum arabic and a filler,wherein the filler comprises calcium carbonate alone or in combinationwith substances selected from the group consisting of kaolin, calciumsulphate, citrate, titanium dioxide and mixtures thereof, wherein thecomposition comprises: between 40% and 95% by weight of gum arabic withrespect to the total dry material weight of the composition, and between5% and 60% of calcium carbonate with respect to the total dry materialweight of the composition, wherein the composition has a viscosity ofbetween 80 and 600 cps, measured with a Brookfield RVT viscometer atroom temperature, wherein the coated paper wrapper wraps a tobacco rodof a smoking article, and wherein the coated paper wrapper provides aself-extinguishing smoking article having an SE value equal or higherthan 75% and a FASE value equal or lower than 15%.
 15. The coated paperwrapper according to claim 14, wherein such paper wrapper comprises, atleast, areas coated with an ink composed by: a percentage of drymaterial of between 25 and 40% by weight with respect to the totalcomposition, between 40% and 95% by weight of gum arabic with respect tothe dry material weight, between 5 and 60% by weight, of calciumcarbonate with respect to the dry material weight, 3.5% by weight, of acombustion agent selected from the group consisting of trisodiumcitrate, tripotassium citrate, and mixtures thereof, the coated paperwrapper having an initial air permeability of between 10 CU and 150 CU.16. A self-extinguishing smoking article which comprises the coatedpaper wrapper defined in claim 14, wherein the coated paper wrapperwraps a tobacco rod of the smoking article, and wherein the coated paperwrapper provides a self-extinguishing smoking article with an SE valueequal or higher than 75% and a FASE value equal or lower than 15%.
 17. Acomposition for coating paper wrappers for smoking articles consistingof water, between 40% and 95% by weight of gum arabic with respect tothe total dry material weight of the composition, and a fillerconsisting of calcium carbonate and substances selected from the groupconsisting of kaolin, calcium sulphate, citrate, titanium dioxide andmixtures thereof, wherein the calcium carbonate is present in an amountof between 5% and 60% by weight with respect to the total dry materialweight of the composition, wherein the composition has a viscosity ofbetween 80 and 600 cps, measured with a Brookfield RVT viscometer atroom temperature, and wherein a smoking article comprising a paperwrapper coated with the composition is self-extinguishing and has an SEvalue equal or higher than 75% and a FASE value equal or lower than 15%.18. The composition according to claim 17, wherein the filler comprisescalcium carbonate and a citrate selected from the group consisting oftrisodium citrate, tripotassium citrate, and mixtures thereof.
 19. Acoated paper wrapper for obtaining a self-extinguishing smoking article,wherein such coated paper wrapper comprises the composition defined inclaim 1 as a total or partial coating.
 20. A coated paper wrapper forobtaining a self-extinguishing smoking article, wherein such coatedpaper wrapper comprises the composition defined in claim 17 as a totalor partial coating.